1 Answer
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If you can easily select the vertices that you want to separate, then what you are looking for is P> By Selection. You may also be able to use the By Material or By Loose Parts options depending on your use case.

$\begingroup$But is there any other way?$\endgroup$
– DanielCMKNov 7 '15 at 14:23

$\begingroup$No. What exactly do you need you separate?$\endgroup$
– VRMNov 7 '15 at 14:25

$\begingroup$Well, when I tried to join objects, the origins were at different points, so I couldn't animate it.$\endgroup$
– DanielCMKNov 7 '15 at 14:27

$\begingroup$When you join two objects, then whichever is active will retain its origin, and the other mesh will be joined to that mesh. I still don't get exactly what your issue is. Could you update your question?$\endgroup$
– VRMNov 7 '15 at 14:31

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$\begingroup$In the 3D window, select the object that has an origin in the wrong place. Choose Object -> Transform... -> Origin to Geometry and it will move the origin to the weighted center of the mesh.$\endgroup$
– MattNov 7 '15 at 20:14

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